UCA BUSHING REMOVAL/BALL JOINT BOOT QUESTION

I think you got two sets of direction there in GeorgeH's post, the first was you need to remove the bushing's outer shell yet, the second was to knock the UBJ from the knuckle.
You appear to have accomplished the latter, and just cut and split the outer shell, they'll curl right in and pop thru. I can burn that out w/a torch, but even just heating a line one
end to the other till she glows will shrink it when it cools, then an easy knock out. An air chisel works well & quick, but can mar & nick the crap out of your arm if you're not careful.
Some HD app. arms had a "back-up" ring also over the bushing on the inside of the arm, which makes it a little trickier, and it's not a joy to attempt to re-install said ring.